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Thread: Working out wire size for load

  1. #1
    Join Date
    Apr 2008
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    West Victoria
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    Working out wire size for load

    Having a bit of a brain fart tonight and can't remember the formula to work out the wire size for the lights I want to install.

    The led lights are 27w @ 12v

    My brain is telling me that if I divide 27 by 12 it will give me 2.25amps. So I should be fine with 2mm/10amp wire.

    Is this correct or have I mucked it up somehow?

    How do I work out how much loss I get over distance?

    From the fuse box to the switch then to the light will be about 5-6 metres.

    Should I get 3mm wire?

    Thanks in advance
    Neale

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  2. #2
    Join Date
    May 2006
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    Woolgoolga
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    Correct in your maths. But you will have volt drop, i'd go 3mm.

  3. #3
    Join Date
    Dec 2017
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    wandin nth vic
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    Quote Originally Posted by Vern View Post
    Correct in your maths. But you will have volt drop, i'd go 3mm.
    And a relay to reduce VD again.

  4. #4
    Join Date
    Apr 2018
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    Adelaide
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    Wire size app

    Download the Blue Sea Systems app. You can enter in all your parameters and it will tell you the size you should be using.

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